http://www.filehelpers.net
The FileHelpers are an easy to use .NET library written in C#. Is designed to read/write data from flat files with fixed length or delimited records (CSV). Also has support to import/export data from different data storages (Excel, Access, SqlServer)
Code on GitHub: https://github.com/MarcosMeli/FileHelpers

Fuzzball Muck is a networked multi-user MUD chat server. It is user-extensible, and newer versions (6.x) support advanced features such as GUI dialogs, through close client-server cooperation with Trebuchet or other clients that support MCP-GUI.

Modular, touch screen friendly car navigation system with GPS tracking, realtime routing engine and support for various vector map formats. There's a GTK+ and a SDL user interface and also a GL accelerated 3d view.